There are several good network testing tools, but none of them will be able to tell you directly if the switch is causing the bottleneck. Basically, you'll nee to do some speed tests with the switch connected,

There are several good network testing tools, but none of them will be able to tell you directly if the switch is causing the bottleneck. Basically, you'll nee to do some speed tests with the switch connected, then get rid of the switch, and do your tests without it being in the loop. If the second set of tests are significantly faster, then the switch was the cause of the bottleneck.

you can use a very simple tool like jPerf, or use something more advanced, like ixChariot

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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

One of the main issues with network wires is that you never have enough. You run plenty and plan for the worst case but you still end up needing more. What many people do not realize is with 10BaseT and 100BaseT (but not 1000BaseT) networks you …

This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg).
If you're looking for how to monitor bandwidth using netflow or packet s…